Exercise machine



FIG. 1 is a front-left-top perspective view of an exercise machine showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view thereof, in which the bench is shown in an alternate position; and,

FIG. 9 is a perspective view thereof, in which the bench is shown in a second alternate position. 

The ornamental design for an exercise machine, as shown and described. 